Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
is unreliable
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "is unreliable" is correct and usable in written English.
It can be used to describe something or someone that cannot be trusted or depended upon. Example: "The data from that source is unreliable, so we should verify it with additional research."
✓ Grammatically correct
News & Media
Science
Alternative expressions(7)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
Even the unreliability is unreliable.
News & Media
Power is unreliable.
News & Media
The space is unreliable.
News & Media
The index is unreliable.
News & Media
But this approach is unreliable.
News & Media
Cellphone reception is unreliable.
News & Media
Today's system is unreliable – or worse.
News & Media
And even that information is unreliable.
News & Media
George is unreliable... untrustworthy... to coin a phrase, a dolt".
News & Media
Tanzi agreed with Hartung's assertion that animal testing is unreliable.
News & Media
"Some data has to be ignored because it is unreliable".
News & Media
Expert writing Tips
Best practice
When using "is unreliable", provide context to explain why something lacks reliability. For example, specify the conditions, data, or sources that contribute to its unreliability.
Common error
Avoid using "is unreliable" without sufficient evidence or justification. Ensure your assessment is based on factual analysis and not personal bias.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "is unreliable" functions as a predicate adjective, modifying a subject to indicate a lack of dependability or trustworthiness. As stated by Ludwig AI, the phrase is correct and usable in written English. Examples from Ludwig showcase its use in various contexts, such as describing data, systems, or sources.
Frequent in
News & Media
54%
Science
38%
Formal & Business
8%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "is unreliable" is a common and grammatically correct way to express that something lacks dependability or trustworthiness. Ludwig AI confirms its usability in written English. It appears frequently in news, media, and scientific contexts to warn against trusting certain information or systems without verification. While versatile, it's essential to provide context for why something is deemed unreliable and avoid overstating unreliability without sufficient evidence. Alternatives like "is not dependable", "is untrustworthy", and "cannot be trusted" offer similar meanings with subtle differences in emphasis.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
is undependable
Direct synonym for "is unreliable".
is not dependable
Focuses on the lack of dependability.
is untrustworthy
Highlights the lack of trustworthiness.
cannot be trusted
Emphasizes the inability to place trust.
is not to be depended on
Explains that something should not be relied upon.
is questionable
Suggests doubt or uncertainty.
is not credible
Focuses on the lack of believability.
is uncertain
Indicates a lack of certainty or predictability.
is inconsistent
Highlights the lack of consistency.
is erratic
Focuses on unpredictable behavior or performance.
FAQs
How can I use "is unreliable" in a sentence?
You can use "is unreliable" to describe something that cannot be trusted or depended upon. For example: "The data from that source "is unreliable", so we should verify it with additional research."
What can I say instead of "is unreliable"?
You can use alternatives like "is not dependable", "is untrustworthy", or "cannot be trusted" depending on the context.
Is it better to say "is unreliable" or "unreliable"?
Both "is unreliable" and "unreliable" are correct, but they function differently. "Is unreliable" is a predicate adjective phrase, while "unreliable" is simply an adjective. The choice depends on the sentence structure.
What's the difference between "is unreliable" and "is inaccurate"?
"Is unreliable" means something cannot be trusted or depended on, while "is inaccurate" means something contains errors or is not correct. While related, they emphasize different aspects of a deficiency.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested